about any measure, steve cohen is a financial superstar, amazing success at picking stocks has made him one of the richest, most powerful stars on wall street. now his reputation and his empire may be in jeopardy. a federal criminal investigation appears to have him in the crosshairs. whenever the stock market is open, you usually can find steve cohen here, at the center of the football field-sized trading floor in connecticut, home to his hedge fund. for almost two decades, he has wracked up 20% to 30% annual return for his investors, losing money only one year, leading one magazine to dub him the most brilliant hedge fund manager alive. >> he is viewed as one of the top, top traders that has ever, ever worked on wall street. >> reporter: and does he live large, worth about $9 billion, he owns this lavish estate with a 36,000-square hp foot house and holes for golf. his art collection is valued at almost $1 billion, with works by van gogh and andy warhol. >> the edge he has gotten is not just from his own insight but perhaps from other means that are not legal. >> reporter: so far, fed
